Unit 2: Chemistry of Life 2 Flashcards Preview

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Flashcards in Unit 2: Chemistry of Life 2 Deck (31):
1

Energy comes from the rapid movement of _______ normally, but it could be ______ too.

electrons, neutrons

2

E represents _______

energy

3

Energy of position. (Usually refers to electrons “locked” in a chemical bond.)

Potential Energy (PE)

4

Energy of movement. (Usually refers to electrons that can move freely.)

Kinetic Energy (KE)

5

An element’s or molecule’s properties are usually associated with the number of _______ it has.

electrons

6

Run horizontally on the Periodic Table.

Periods

7

Elements behave _________ as you go across a period.

differently

8

Elements behave ________ as you go down a column or family.

similarly

9

Run vertically on the Periodic Table

Columns or families

10

These occur between elements or molecules.

Chemical bonds

11

This type is the strongest type of chemical bond.

Covalent bond

12

Results from sharing electrons between elements or molecules to fill both outer shells.

Covalent bond

13

They always create a molecule. (The size of the molecule may differ though.)

Covalent bonds

14

__________ molecules carry an electrical charge at opposite poles

Polar

15

__________ molecules do not have an electrical charge.

Non-polar

16

Used to show the shape of the molecule

Structural Formula

17

Tells the elements, and number of atoms of each, that make up a molecule

Molecular Formula (Chemical Formula)

18

These are fairly strong bonds while dry – but are weak in water so they dissolve into ions.

Ionic bonds

19

These bonds are created by gaining or losing electrons between elements so that each element can fill its’ outer most shell.

Ionic bond

20

possess a positive charge because it has more protons than electrons.

Cations

21

possess a negative charge because it has more electrons than protons.

Anions

22

A cation bonded to an anion to make a salt when dry.

Ionic compounds

23

Fairly weak bonds. (It is “like” a magnet) (A positive Hydrogen attracted to a negative “Substance”…usually oxygen.)

Hydrogen bonds

24

These are the most important biological bonds.

Hydrogen bond

25

To ______ a bond requires energy to be consumed. (The bond requires “catching” an electron.)

make

26

To ______ a bond gives off energy. (The electrons are “released” to move again.)

break

27

Located on the left side of an equation.

Reactants

28

Located on the right side of an equation.

Products

29

Matter is neither created nor destroyed just transferred or transformed

Law of the Conservation of Mass

30

If an ________ is on one side of an equation it must be on the other side too

element

31

Chemical reaction is going both ways at equal rates.

equilibrium